默认header

sessions.go

@@ -109,7 +109,13 @@ func (s *Session) PreRequest(request *url.Request) (*http.Request, error) {
 	if err != nil {
 		return nil, err
 	}
-	headers := request.Headers.GetAll()
+
+	var headers map[string]string
+	if request.Headers != nil {
+		headers = request.Headers.GetAll()
+	} else {
+		headers = url.DefaultHeaders
+	}
 	for k, v := range headers {
 		req.Header.Set(k, v)
 	}

url/Headers.go

@@ -16,6 +16,10 @@ const PHeaderOrderKey = "PHeader-Order:"
 // * 请求header 部分
 type Header Common
 
+var DefaultHeaders map[string]string = map[string]string{
+	"user-agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/112.0.0.0 Safari/537.36 Edg/112.0.1722.68",
+}
+
 func (h Header) Add(key, value string) {
 	textproto.MIMEHeader(h).Add(key, value)
 }